Amplifying device for talking-machines.



APPLICATION FILED APR. 13, I918.

Patented Dec. 24, 1918.

jnvezzzor Barneys.

JOSEPH woLrr, or BROOKLYN, NEw'ionK, \A'SSIGNOR To SONOBA rnonosnarn CORPORATION-,- A CORPORATION or NEW YORK.

AMPLIFYING DEVICE FOR TALKING-MACHINES.

Specification of Letters Patent.

Patented Dec. 24, 1918.

Application filed April is, 1918. Serial No. 228,464.

To all whom it may concern Be it known that I Josnrn' Water, a subject of the King of Great Britain and Ireland, and residing at Brooklyn, in the county of Kings, city and State of New York, have invented certain new and useful Improvements in Amplifying Devices cabinet.

The obiectof my invention isfto make the sonnd boards nsed in ccnnection'with my sound amplifying device resonant hyplac ing the boards constitutingfthe'walls of the amplifying device under tensioii inf ordert'o causethe' same to readily vibrate insyfnpathy' with the air inclOsed betweenthe same; I i l Another object of my inventionis" to provide improvements in apparatiis for repro: dncin'g' sound by meansr which the 'qnfal ity'andnatural-tress 0f the recorded sounds are reprodnced' with greater 'faithfiilness, and" to impart resonance w the reproduced sounds. i f

Another object of thei nventionisto so improve and cor'istru'ct the amplifying de-' vice that the resonance and qualitypf the reproduced sound Wil-l'be' increased, and intensified.

A- further object is toprovide means wh'e'niby the tension of the amplifier" may be varied, I

A further object of the invention is the provision of means of'th'e character de: scribed, which are'extr'emely simple in con str'uction, neat and attractive in appearance,-

thoroughlyreliable and "efiioientinits pur; pose, and inexpensive t'o manufactnre:

With these and other objects in view tobe more fully set forth hereinafter; the invention consists in the'n'ovel construction, com binatio'a'r of elements, and arrangernentpf parts which will be exemplifiedin thefconstruction hereinafter described in the specification and illustrated inthe' accompanying drawings consideredtogether or separately;

The inventive-idea 'involved 'is capable' of receivinga variety of mechanical express'ions, some of which for the purpose of illustrating the invention, are shown in the accompanying drawings.

The invention will be first described in connection with the accompanying draw ing's, wherein similar reference characters are used to designate corresponding parts throughont the several views, and then more specifically defined and indicated in the appended claims.

In the drawin s,'

Figure 1 is a longitudinal sectional view of a double Walled amplifier embodying my invention;

Fig. 2 is' a similar view of a modification; and

Fig'. 3 is a detail front elevation of a further modification.

In carrying out the, preferred embodiment of my invention, 1 provide an amplifier Having an inner wall, 1, having a neck 2, and an outer wall 3. The outer wall sur rounds the entire exterior of the inner wall and neck, and produces an inclosed air space 4' entirely snrrounding the amplifier.

To give great resonant quality to the amplifier, I provide a series of filamentous tensioning dBVlCBS SuCh as cords or Wire's 5 which preferably extend longitudinally the entire lengths of the walls and neck and fol low the contour thereof. The wires are disposed between the walls of the amplifier Within the inclos'ed dead air space,- and are secnred therein at one end, preferably at the neck end. The wires extendnea'rly to the front or mouth of the amplifier, and are attached to rotatable pins or egs 6','s'iinilar to violin pegs" mounted in the'walls of the amli'fier, whereby" the tension of the wires may e adjusted.

The wires are capable of'ind'ependent adjustment, so that the tension of different parts of the" amplifier'may' be varied as desired."

Where" the wires pass around curves or corners, they engage bridges 7 which act as guides for the Wires and serve to support the wires'awayfrom the wall's'of the-amplifier. The cords or'wires may be, so arranged as tosnrroundtheentire amplifier, by being placed on all sides thereof; or the cords or Wire's may be'arran'gedon only part of the amplifier if desired;

I have found that a sound amplifying device constructed and arranged in this man-- ner, gives added strength to the device as a. resonator, produces vgreat efficiency, and tone e, quality-and naturalreproduction, that t ness of the recorded sound are reproduced with greater faithfulness, and thatthe' re- Produced sound will be increased and intenslfiedg v. I

In the modification illustratedlin, Fig. 2,.

I show a single walled amplifier 1, having wires 5 extending along part of its length only j and on the outside: of the ,famplifien. In some cases the neckofthe amplifier is a. -sol id,-, heavyblock, and the form; ofthe invention shown in Fig, 2 is particularly ap the parts in osit-ten. Shafts 2, 13. ,an'aie extend across theother sides vof; the ampli fier, and are driven from the shaft Sthrough bevel gearing 15. flhe' ends;of,thew1 res 5 are wound uponfthe shafts,

The amplifier; be made of- ',any sired' material bnt LI preferably employ wood Orother fibrous materiat forfthis pur pose. ,Thepartsmayiib'e made offal single thickness of material, or, they may be ;lami.-. Hated H- r. i v By tightening ate wires. the, material of e amplifier ay, be i put infidel; tension to.

suchan extent as-desiredbt understl d ifiiiiimtliiihit my invention to amplifier. ofgrectangular form, but thatthesame maybe (if, any form, such as cylindrical, conical -,.octagonal, or otherwiseb In accordance. with the provisions of, the patent statute, I have describedthe principle of my inventiontogether with the apparatus which I now consider to represent the best embodiment thereof, lbut I desire it understood, thatmy invention, is not contfined to the particular form ofgapparatus herein shown and described, the samebe ing merely illustrative, and that the invention canlbe carriedout in otherwayswithout departingfrom the spiritpf my invention, and, therefore, I claim, broadly; the right to employ all equivalentinstrumentalities coming, within-the scope of the appended-claims, and by? means ofwhich-objects of. my invention are. attained andtthe new results accomplished, .asgherein SBtifOlftll, as it is obvious that the particular embodiments herein shown and describedvare only some of-many that can be employed'to attain these objects and accomplish these re- Having now described my invention, what I claim and desire to secure by Letters Patent is as follows '1. A sound amplifier for talking machines, comprising-a shell, a plurality of filamentous tensioning members arranged upon and extending over the outer surface of the shell, said members being secured at both their ends to the shell, means for supporting the tensioning members awav from the shell,

and means mounted on tlie shell for adjusting thetension of said tensioning members.

2. A sound amplifier for talking machines,- n

comprising a shell, a plurality of filamentous tensioning members arranged upon and extending over the outer surface of theshell and following. the contour thereof, said I members'being secured at both their ends to the shell, means for supporting the ten-. sioning members between their. ends away from the shell, and means for adjusting the tension of said tensioning members,

, 3. A sound amplifierfor talking machines,

comprising a shell, aplurality of filamentous tensioningmembers arranged upon and ex;v tendin longitudinally. over the outer surface 0%; thereof, said members being secured at'both their ends to the shell, means for supporting the tensioning members between their ends away from the shell, 'and means for adjust the shell and following the contour ingthe tension ofsaid tensioning members.

4;. A sound amplifier for talking machines, comprising an inner; and an outer shell, a plurality of filamentous, tensioning members arranged between the shells and securedzfat both'their ends to, theshells, means for sup- 4 porting the tensioningmembersaway, from the shells, {and means mounted on the shells for adjusting the tension ofthe tensioning members. i 1

-5. A soundamplifier foritalking machines, comprising an inner and an outer shell, a plurality of filamentous tensioning members arranged between the-shells and following the contour thereof, and secured at i both their ends-to the shells, means for support- .mg: the tensioning members away from the inner andf outer 'shells, and means for adjusting'the tension. of the tensioning members. i

6. A sound comprising-an-inner and an outer shell, a plurality offilamentous tensioning members arranged: between the shells and extending longitudinally and following the contour amplifier for talking machines,

thereof, said members being secured atboth their. ends to the shells, means for supporting the tensioning members away from the shells, and means for vadjusting the tension of said tensioning members.

7. A sound amplifier for talking machines, having tension devices, and means cooperating with the tension devices to adjust them simultaneously to any desired extent with one operation.

8. A sound amplifier for talking machines, comprising an inner and outer shell, tension devices between the shells, and means cooperating with the tension devices to adjust them simultaneously to any desired extent with ne operation.

9. A sound amplifier for talking machines, comprising a shell, a plurality of filamentous members secured at their ends to the shell, means between the members and the shell for supporting the members, and means for simultaneously adjusting the length of the members.

10. A sound amplifier for talking machines, having a plurality of shafts surrounding the edges of the amplifier, bevel gearing connecting said shafts to drive the shaft, wires wound upon the shafts, means cooperating with one of the shafts to simultaneously adjust the wires at the same time.

This specification signed and witnessed this 11th day of April, 1918.

. JOSEPH WOLFF.

Witnesses:

JOHN L. LOTSCH, MAY J ONES.

Copiel of thin patent may be obtained for Me cent: each, by sddreulng the "Oomminioner of Patontl, wuhlngton, D. 0." 

